System of automatic control



March 28, 1933. J. LEONPACHER SYSTEM OF AUTOMATIC CONTROL Filed June 7, 1928 as. as, 1933 UNITED STATES PATENT OFFICE 10m IIIOIPAOm OI MUNICH, GERMANY, ASBIGNOB TO "BROWN, BOVERI AND cm... 0] BAD, SWITZERLAND l SYBTEI O1 AUTOMATIC CONTROL Application mu June 1, 1928, Serial No.

When a plurality of (say 12.) current enerating machines feed a common networ it is usual for the management to lay down for n-l machines a so-called power time table which determines .exactly for each machine what power it has to generate and supply to the common network at any given moment, the function of the last machine being to maintain the periodicity, i. e., to supply sufiicient ower to the network to prevent the peri icit either rising or falling. It is the duty of the switchboard attendant by suitably controlling the servo motor to see to it that the time tables laid down for the separate machines are adhered to and that the periodicity is kept constant. The arrangement described hereinafter efiects more palliticularly the former action automatica y.

The arrangement consists substantially of a clock and a power indicator.

The invention will be described by way of example with reference to the accompanying drawing, wherein Figure 1 shows an arrangement for controllin the power output of an electric generator driven by -a water turbine W by means of a pin S sliding in the slot P of a timetable T and coacting with the pointer Z of the wattmeter 70. Figure 2 shows the timetable fastened to and raised from the surface of the drum 3 rotatable by clockwork.

The clock drives a drum provided with an hour scale, which makes one revolution in 24 hours. On the surface of the drum the power time table cut out of cardboard or sheet metal is fixed 'in such a manner that I above each hour division there appears the power output in megawatts of the machine to be controlled prescribed for this moment.

The datum-line of the time table, on which the times from 0 to 24 oclock are inscribed,

must therefore be just as long as will go completely round the drum. In the accompanying drawing T is the developed surface of g the timetable and? the slot fixed in it.

B means of thes ring F a pin S which is gui ed in a longiturfinal slot or by means of a link is pressed against the contour of the time table T, which is raised somewhat from 888,887, and in Germany June 11, 1921 work to make a complete revolution in 24;

hours.

The motion of the pin S is transmitted by means of a rod X to a lever H which is pivoted so as to turn about the axis of rotation of the pointer Z of the wattmeter k of the machine to be controlled, in such a'manner that the centre line bb of the pivoted ,lever H adjusts itself to a power indication on the wattmeter scale corresponding to the power on the time table where the pin S at the moment rests.

When the wattmeter pointer Z is in the same position asthe centre line bb' of the lever H, that is in the position shown in the drawing, this signifies that the power developed by the machine to be controlled at the moment in question agrees with the power which the machine is to give off according to the prescribed time table P. When the wattmeter pointer is more to the left, the power of the machine is smaller than that which it should develo according to the time table. .In this case tlib pointer, after travelling through a small clearance closes through the contact a the armature circuit of the servo motor M, such that the servo motor will cause the machine to develop more power. When the wattmeter pointer is too far to the right,

that is should the power developed by the machine be greater than that which it should develop according to the time table, the pointer will close over the contact a the armature circuit of the servo motor in the op posite sense and will cause the machine to develop less power.

This automatic regulating operation will in each case continue until the wattmeter pointer Z oscillates freely between the stops a and a, that is until the power developed by the machine corresponds to the power it should develop according to the time table.

A water turbine W is rovided for driving the electric enerator the guide blades of the said tur ine being displaced by the regulator R. The pivot d of the regulator The the surface of the drum 3 so that when tr'av- 1 2 accents lever c is dispiaced Tog means of being tastened to the nut m, w ich is d iacea ie on the screw spindle a driven by t e motor M. Of course this arran ement is only one of the 5 numerous constructional forms possible ac cording to the invention.

The above description relates to the control efiected by a power time table. The er rangement may of course he used in the same manner for operating with another time table for instance-atoitage, periodicity, idle cur rent, swam pressure and the like time table Simiiarly the fire of a boiler may he antematicaiiy controlled by increasing the draught and ecceierating the coal supply; with or without a corresponding lead with re spect to the power time table. I i What I claim is;

Means for controlling the output of an electric generating piant com risin astrip of sheet material the width 0 whic at any point corresponds to a given power output a iollowing device ada ted to follow variations in the width of sai stri means for conveying said stri past said oilowing device a pair of relatively fixed contacts ada ted to ice-moved by said followin device, a t ird contact situated between sai relatively fixed contacts, means for moving the third contact in accordance with the out at of the plant and means for increasing t e output of the plant when the third contact contacts with one of the said relativelv fixed contacts and decreasing the output of the plant when the third contact contacts with the other rela tively fixed contact.

In testimony whereoi I have signed by name to this specification.

JOSEF LEONPAOERQ 4.0 

